Regex Tester
Write a regular expression, paste some test text, and see exactly what matches and where. Every match is listed with its index, so you can confirm a pattern catches what you intended and nothing more.
Free, no signupRuns entirely in your browser
Input
Result
- Match Count
- 2
- Matches
- Match #1: "info@vibeland.xyz" at Index 14Match #2: "hello@example.com" at Index 35
About
What the Regex Tester does
Testing against real examples matters because regex failures are usually silent. A pattern that is slightly too greedy still runs — it just captures more than you meant, and the bug appears much later in whatever consumes the result.
How it works
Using the Regex Tester
- 1Enter your regex pattern without the surrounding slashes.
- 2Set flags — g for all matches, i for case-insensitive, m for multiline.
- 3Paste the text to test against.
- 4Every match is listed with its text and character position.
- 5An invalid pattern reports the compilation error instead of failing silently.
Use cases
What people use it for
- Building a validation pattern for a form field
- Testing a search-and-replace before running it on real data
- Extracting structured values from log lines
- Debugging a pattern that matches too much or too little
FAQ
Frequently asked questions
6 related
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